ga-key

   1 #!/usr/bin/env bash
   2
   3 #=======================================================================
   4 # ga-key
   5 # File ID: 027211a6-f115-11e4-9e02-000df06acc56
   6 #
   7 # Generate SHA256 sums, use the same format as SHA256 keys in git-annex.
   8 #
   9 # Author: Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later.
  11 #=======================================================================
  12
  13 progname=ga-key
  14 VERSION=0.2.0
  15
  16 ARGS="$(getopt -o "\
  17 h\
  18 q\
  19 v\
  20 " -l "\
  21 help,\
  22 quiet,\
  23 verbose,\
  24 version,\
  25 " -n "$progname" -- "$@")"
  26 test "$?" = "0" || exit 1
  27 eval set -- "$ARGS"
  28
  29 opt_help=0
  30 opt_quiet=0
  31 opt_verbose=0
  32 while :; do
  33     case "$1" in
  34         -h|--help) opt_help=1; shift ;;
  35         -q|--quiet) opt_quiet=$(($opt_quiet + 1)); shift ;;
  36         -v|--verbose) opt_verbose=$(($opt_verbose + 1)); shift ;;
  37         --version) echo $progname $VERSION; exit 0 ;;
  38         --) shift; break ;;
  39         *) echo $progname: Internal error >&2; exit 1 ;;
  40     esac
  41 done
  42 opt_verbose=$(($opt_verbose - $opt_quiet))
  43
  44 if test "$opt_help" = "1"; then
  45     test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  46     cat <<END
  47
  48 Generate SHA256 sums, use the format used by the "SHA256" backend in
  49 git-annex.
  50
  51 Usage: $progname [options] FILE [FILE ...]
  52
  53 Options:
  54
  55   -h, --help
  56     Show this help.
  57   -q, --quiet
  58     Be more quiet. Can be repeated to increase silence.
  59   -v, --verbose
  60     Increase level of verbosity. Can be repeated.
  61   --version
  62     Print version information.
  63
  64 END
  65     exit 0
  66 fi
  67
  68 test -z "$1" && { echo $progname: Missing filename >&2; exit 1; }
  69
  70 for file in "$@"; do
  71     if test ! -f "$file"; then
  72         test $opt_verbose -ge 0 && echo $progname: $file: Ignoring non-file >&2
  73         continue
  74     fi
  75     echo SHA256-s$(
  76         wc -c "$file" | cut -f 1 -d ' '
  77     )--$(sha256sum "$file" | head -c 64)
  78 done